CN101710143A - Four-range voltage measuring meter - Google Patents
Four-range voltage measuring meter Download PDFInfo
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- CN101710143A CN101710143A CN200910155427A CN200910155427A CN101710143A CN 101710143 A CN101710143 A CN 101710143A CN 200910155427 A CN200910155427 A CN 200910155427A CN 200910155427 A CN200910155427 A CN 200910155427A CN 101710143 A CN101710143 A CN 101710143A
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Abstract
The invention provides a four-range voltage measuring meter with three measuring panels for measuring DC voltage. In the four-range voltage measuring meter, a first step panel consists of a 22*100 omega measuring panel; a second step panel comprises a measuring panel formed by a 11*110 omega annular resistance mesh, and an auxiliary panel formed by 10 5-omega resistors; a third panel is a double slide wire panel; and two measuring panels and measuring slide wires are connected by lead wires. The four-range voltage measuring meter ensures that variation and thermal electromotive force have no influence when the voltage measuring meter is used for measuring without switching by a switch, and saves two auxiliary panels of the first step panel.
Description
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
For the pressure measuring instrument that three measuring disk are arranged, telophragma generally adopts switch to switch, and so just produces the variation of contact resistance, brings restriction to resolution a few days ago.In order to overcome this problem, generally adopt big brush with the increase contact area, and adopt silver-carbon/carbon-copper composite material; The patent No. 200720109904.3,200720107583.3,200720107586.7 discloses has three four-range pressure measuring instruments of measuring disk to solve the variation new method of switch contact resistance, its first step disc is made up of a measuring disk and two bracket panels, two measuring disk connect the back and are connected between two measurement terminals with slide wire disc, brush on the step disc switch is got rid of outside the measurement loop, do not exist switch to switch between the resistance on three measuring disk, just do not produce variation yet; Because first step disc has three layers, make switch and apparatus structure become complicated, increased the height of instrument simultaneously.
Summary of the invention
The objective of the invention is to design a kind of four-range voltage measuring meter, telophragma does not switch by switch in the connection of three measuring disk, and two bracket panels of first step disc cancellation.
Technical scheme of the present invention is taked like this:
Electric current from the positive pole of pressure measuring instrument 4.5V working power through the setting resistance R of the resistance measurement network on two step discs and the two slide wire disc to 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 344 Ω resistance R
0, through the adjustable resistance R of 20 17 Ω resistance compositions
P1And range of adjustment adjustable resistance R between 0～18 Ω
P2Get back to the negative pole of working power and form pressure measuring instrument work loop; Standard cell E
NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Set up resistance R to 485 Ω
NAnd the lockable adjustable resistance R of range of adjustment between 0～1 Ω
P3, process 100K Ω current-limiting resistance R is to standard cell E again
NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U
X" two terminals, behind the resistor network of anodal terminal through the two slide wire discs of two measuring disk and, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears connect one of 100 Ω resistance between each gear contact; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 100 Ω, wherein one is measurement slip III, another root is auxiliary slip III ', and the index dial of two slide wire discs divides 10 big lattice, and the resistance of every big lattice correspondence is 10 Ω, every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; Second step disc is made up of measuring disk II and bracket panel II ', measuring disk II has 0,1,2 ... 10 totally 11 gears have the resistance of 11 110 Ω to connect into ring network: the 1st resistance R above
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, the 10th resistance R
10The other end and the 11st resistance R
11The point that connects of an end be circuit node A, the 11st resistance R
11The other end and the 1st resistance R
1Other end tie point be circuit node B, resistance R
1With resistance R
2Tie point be connected resistance R through 200 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 120 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 60 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 20 Ω resistance with the 4th contact
5With resistance R
6Tie point be connected resistance R with the 5th contact
6With resistance R
7Tie point be connected resistance R with the 6th contact
7With resistance R
8Tie point be connected resistance R through 20 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 60 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 120 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 200 Ω resistance with the 10th contact
1With resistance R
11The Node B that connects o'clock is connected with the 0th contact through 300 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc; Pass through 2000 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the brush of bracket panel II ' connects the 22nd contact of measuring disk I and connects the 0th contact connecting circuit node A of measuring disk I, bracket panel II ' the 10th contact and 23000 Ω resistance R
13End point in parallel be node C, resistance R
13The other end connect to measure top " 0 " point of slip III, the end " 10 " of measuring slip III is o'clock through 900 Ω resistance R
14Back connecting circuit Node B; Node C is through 190/7 Ω resistance R
15Back and 13 Ω range transfer resistance R
16One end is connected in parallel on node D, and node D connects the positive pole of pressure measuring instrument working power, range transfer resistance R
16The other end be connected in range selector K
1-1* 0.01 range contact and * 0.1 range contact, 117 Ω range transfer resistance R
17An end connect range selector K
1-1* 1 range contact, the other end and range selector K
1-1* 0.1 range contact connects Node B connection range selector K
1-1* 10 range contacts after with range selector K
1-2* connection of 1 range contact; Range selector K
1-2* 1 range contact and range selector K
1-2* 0.1 range contact is through 117 Ω range transfer resistance R
18Connect range selector K
1-2* 0.1 range contact and range selector K
1-2* 0.01 range contact is through 11700 Ω range transfer resistance R
19Connect range selector K
1-3* 10 range contacts and range selector K
1-3* 1 range contact is through 1053 Ω auxiliary resistance R
20Connect range selector K
1-3* 1 range contact and range selector K
1-3* 0.1 range contact is through 104.13 Ω auxiliary resistance R
21Connect 104.013 Ω auxiliary resistance R
22An end connect range selector K
1-3* 1 range contact, the other end and range selector K
1-3* 0.01 range contact connects three cuttves, four throw switch K
1Three layers: K
1-1Layer, K
1-2Layer and K
1-3Three normally closed contacts of layer connect range selector K with lead
1-3* 10 range contacts connect the setting resistance R
NNoble potential one end; Pressure measuring instrument connects measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K
2The back is connected with auxiliary slip III '.
By above technical scheme, first step disc has saved two bracket panels, makes potential difference meter simple in structure, volume-diminished, also reduced production cost, in equalizing network, do not passed through switch on the circuit of three measuring disk connections simultaneously, so do not have variation and thermoelectric potential influence; The brush of first step disc and two slide wire discs switches and causes that change in resistance does not influence measurement numerical value, only influences the galvanometer damping, and compares brush with the resistance variations of whole equalizing network and switch and cause that change in resistance can ignore.
Description of drawings
Fig. 1 is a principle of the invention circuit.
In Fig. 1, the measuring disk I of 22 * 100 Ω, expression measuring disk I is made up of the resistance of 22 100 Ω; In like manner, the adjustable resistance R of 20 * 17 Ω
P1, expression adjustable resistance R
P1Form by 20 17 Ω resistance, the bracket panel II ' of 10 * 5 Ω, expression bracket panel II ' is made up of the resistance of 10 5 Ω, and resistance R in the resistance ring network of expression measuring disk II is arranged in the resistance ring network of measuring disk II " 10 * 110 Ω "
1～resistance R
10Ten resistances all are 110 Ω.
Embodiment
In Fig. 1, measuring disk II is 11 the 110 end to end resistance rings of Ω between node A and Node B, when measuring disk II puts " 5 " or puts " 6 ", the brush of measuring disk II is to being that 5 110 Ω resistance are in parallel with 6 110 Ω resistance between the Node B, back in parallel resistance is 300 Ω to the maximum, other contact of measuring disk II all is connected to 300 Ω to the resistance value between the Node B and is as the criterion, and corresponding point directly are connected on the 5th, 6 contacts and the resistance ring; When measuring disk II put " 4 " or puts " 7 ", the brush of measuring disk II was to being that 4 110 Ω resistance are in parallel with 7 110 Ω resistance between the Node B, and back in parallel resistance is 280 Ω, so the 4th, 7 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II put " 3 " or puts " 8 ", the brush of measuring disk II was to being that 3 110 Ω resistance are in parallel with 8 110 Ω resistance between the Node B, and back in parallel resistance is 240 Ω, so the 3rd, 8 contacts are connected with corresponding point on the resistance ring through 60 Ω resistance; When measuring disk II put " 2 " or puts " 9 ", the brush of measuring disk II was to being that 2 110 Ω resistance are in parallel with 9 110 Ω resistance between the Node B, and back in parallel resistance is 180 Ω, so the 2nd, 9 contacts are connected with corresponding point on the resistance ring through 120 Ω resistance; When measuring disk II set or when putting " 10 ", the brush of measuring disk II is to being that 1 110 Ω resistance is in parallel with 10 110 Ω resistance between the Node B, and back in parallel resistance is 100 Ω, so the 1st, 10 contacts are connected with corresponding point on the resistance ring through 200 Ω resistance; When measuring disk II reset, the 0th contact of measuring disk II is to being to connect with 300 Ω resistance between the Node B.
The brush of the brush of the measuring disk II of second step disc and bracket panel II ' is synchronous, and during the second step disc reset, the brush of bracket panel II ' is that two resistance that are both 2300 Ω are in parallel with resistance value between the Node B, is 1150 Ω therefore.
During the second step disc set, the calculating of resistance value need be carried out triangle-star conversion between the brush of bracket panel II ' and the Node B, establishes resistance (R
2+ R
3+ ... + R
9+ R
10) and resistance R
11The both sides resistance is equivalent to resistance r
1, resistance R
11With resistance R
1The both sides resistance is equivalent to resistance r
1' resistance (R
2+ R
3+ ... + R
9+ R
10) and resistance R
1The both sides resistance is equivalent to resistance r
1", be equivalent to resistance r
1, r
1', r
1" intersection point is Q
1:
R then
1=(R
2+ R
3+ ... + R
9+ R
10) * R
11/ (R
1+ R
2+ ... + R
10+ R
11)=9 * 110 * 110/11 * 110 Ω=90 Ω
r
1’＝R
1×R
11/(R
1+R
2+…+R
10+R
11)＝110×110/11×110Ω＝10Ω
r
1”＝(R
2+R
3+…+R
9+R
10)×R
1/(R
1+R
2+…+R
10+R
11)＝9×110×110/11×110Ω＝90Ω
Resistance value equals (2200 Ω+r between the brush of bracket panel II ' and the Node B
1) * (2000 Ω+200 Ω+r
1")/(2 * 2290) Ω+r
1'=2290 Ω/2+10 Ω=1145 Ω+10 Ω=1155 Ω
When second step disc is put " 2 ", the calculating of resistance value between the brush of bracket panel II ' and the Node B: establish resistance (R
3+ R
4+ ... + R
9+ R
10) and resistance R
11The both sides resistance is equivalent to resistance r
2, resistance R
11With resistance (R
1+ R
2) the both sides resistance is equivalent to resistance r
2' resistance (R
3+ R
4+ ... + R
9+ R
10) and resistance (R
1+ R
2) the both sides resistance is equivalent to resistance r
2", be equivalent to resistance r
2, r
2', r
2" intersection point is Q
2:
R then
2=80 Ω r
2'=20 Ω r
2"=160 Ω
Resistance value equals (2200 Ω+r between the brush of bracket panel II ' and the Node B
2) * (2000 Ω+120 Ω+r
2")/(2 * 2280) Ω+r
2'=2280 Ω/2+20 Ω=1140 Ω+20 Ω=1160 Ω.
In like manner, when second step disc was put " 3 ", resistance value was 1165 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 4 ", resistance value was 1170 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 5 ", resistance value was 1175 Ω between the brush of bracket panel II ' and the Node B,
......
When second step disc was put " 10 ", resistance value was 1200 Ω between the brush of bracket panel II ' and the Node B.
Increase by 5 Ω because measuring disk II is connected the every stepping in back with measuring disk I, so the every stepping of bracket panel II ' reduces by 5 Ω, it is constant that circuit is always hindered.
Node C is 1200 Ω through two step discs to the resistance of Node B, node C process slide wire disc is 24000 Ω to the resistance of Node B, is 2.1mA during the standardization of voltage-measuring equipment working current, when * 10 ranges, electric current is 2mA on the 1200 Ω resistance, and electric current is 0.1mA on the 24000 Ω resistance; According to triangle-star conversion, I is to equivalent resistance r for bracket panel II ' brush process measuring disk
n, r
n', r
n" intersection point Q
n(n=1,2,3 ... 9) resistance and bracket panel II ' brush are through 2000 Ω resistance R
12To intersection point Q
nResistance equate, so flow through measuring disk I and 2000 Ω resistance R
12Electric current respectively be 1mA; When measuring disk II puts " 10 ", bracket panel II ' brush through measuring disk I to the resistance of node A and bracket panel II ' brush through 2000 Ω resistance R
12Resistance to node A all equals 2200 Ω, so flow through measuring disk I and 2000 Ω resistance R
12Electric current also respectively be 1mA.
For ten one the 110 Ω end to end resistance rings of measuring disk II between node A and Node B, resistance R during measuring disk II set
1To be all 110 Ω resistance in parallel with 10 resistances, flows through resistance R
11Electric current be 1/11mA, the voltage U between node A and the Node B
AB=1/11 * 110mV=10mV; Resistance (R when measuring disk II puts " 2 "
1+ R
2) to be all 110 Ω resistance in parallel with 9 resistances, flows through resistance R
11Electric current be 2/11mA, the voltage U between node A and the Node B
AB=2/11 * 110mV=20mV; When in like manner, measuring disk II puts " n " (n=1,2,3 ... 10) voltage U between resistance nodes A and the Node B
AB=n * 10mV; During measuring disk II reset, electric current is without resistance R
11, U
AB=0mV.Measuring disk I, measuring disk II, measure slip III all during reset, measuring disk I flows through the electric current of measuring disk II at U
ABLast 100mV voltage equals to measure the voltage of order to B in the 0th contact of slip III, so the 0th contact and the node A equipotential of measurement slip III.
During the working current standardization, first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝1×100n
1+1×100+n
2/11×110-0.1×900-0.1×10×(10-n
3)(mV)
＝100n
1+100+10n
2-90-10+n
3 (mV)
＝100n
1+10n
2+n
3 (mV)
During * 1 range, the node D 190/7 Ω resistance R of having connected
15Through node C to the resistance sum of Node B be 1170 Ω in parallel with it be 13 Ω resistance R
16The 117 Ω resistance R of having connected
17Totally 130 Ω, 1170 Ω are 9 times of 130 Ω, and therefore, 1/10 working current is that the 0.2mA electric current flows through two step discs to Node B, and it is 0.01mA that electric current flows through the electric current of measuring slip III, and the resistance value that reduces after the parallel connection is advanced 1053 Ω auxiliary resistance R by series connection
20Come the total resistance of holding circuit constant.When first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal: U
x=10n
1+ n
2+ 0.1n
3(mV)
During * 0.1 range, the node D resistance R of having connected
15Through node C to Node B, the 117 Ω resistance R of having connected again
18Sum is 1287 Ω and its parallel resistor R
16Be 13 Ω, 1287 Ω are 99 times of 13 Ω, and therefore, 1/100 working current is that the 0.02mA electric current flows through two step discs to Node B, it is 0.001mA that electric current flows through the electric current of measuring slip III, and the resistance value that reduces after the parallel connection is advanced 104.13 Ω auxiliary resistance R by series connection
21With 1053 Ω auxiliary resistance R
20Come the total resistance of holding circuit constant.When first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal: U
x=n
1+ 0.1n
2+ 0.01n
3(mV)
During * 0.01 range, the node D resistance R of having connected
15Through node C to Node B, the 117 Ω resistance R of having connected again
18And 11700 Ω resistance R
19Sum is 12987 Ω and its parallel resistor R
16Be 13 Ω, 12987 Ω are 999 times of 13 Ω, and therefore, 1/1000 working current is that the 0.002mA electric current flows through two step discs to Node B, it is 0.0001mA that electric current flows through the electric current of measuring slip III, and the resistance value that reduces after the parallel connection is advanced 104.013 Ω auxiliary resistance R by series connection
22With 1053 Ω auxiliary resistance R
20Come the total resistance of holding circuit constant.When first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal: U
x=0.1n
1+ 0.01n
2+ 0.001n
3(mV)
The 3rd dish n
31 μ V be 1 big scale value, every little lattice are 0.1 μ V.
The electromotive force of every series-produced standard cell disperses, and between 1.0188V～1.0196V, standardized working current is 2.1mA, therefore sets up resistance R
NGet 485 Ω, add the lockable adjustable resistance R of 0～1 Ω
P3, variation range that can the coverage criteria cell emf.
Potential difference meter adopts 3 groups of dry cell power supplies, and electromotive force was about 1.65V when dry cell was new, and to 1.4V when following, the electric current shakiness can both make the working current of potential difference meter be adjusted to standardization in order to make dry cell under new, former affection condition, for this reason resistance R with old
0Get 344 Ω, 20 17 Ω resistance are formed adjustable resistance R
P1, adjustable resistance R
P2Range of adjustment is 0～18 Ω.
Normalized current is to determine like this: 2V standard signal voltage is pressed polarity and potential difference meter " U
x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that potential difference meter respectively coils total indicating value, double-point double-throw switch K
2Throw to the left side, regulate adjustable resistance R
P1And adjustable resistance R
P2, make galvanometer G nulling; Again with double-point double-throw switch K
2Throw to the right, regulate adjustable resistance R
P3, make galvanometer G nulling, at this moment adjustable resistance R
P3Locking; When using from now on, potential difference meter is standard according to this.
Claims (1)
1. four-range voltage measuring meter that three measuring disk are arranged, electric current from the positive pole of pressure measuring instrument 4.5V working power through the setting resistance R of the resistance measurement network on two step discs and the two slide wire disc to 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 344 Ω resistance R
0, through the adjustable resistance R of 20 17 Ω resistance compositions
P1And range of adjustment adjustable resistance R between 0～18 Ω
P2Get back to the negative pole of working power and form pressure measuring instrument work loop; Standard cell E
NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Set up resistance R to 485 Ω
NAnd the lockable adjustable resistance R of range of adjustment between 0～1 Ω
P3, process 100K Ω current-limiting resistance R is to standard cell E again
NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U
X" two terminals, behind the resistor network of anodal terminal through the two slide wire discs of two measuring disk and, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears connect one of 100 Ω resistance between each gear contact; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 100 Ω, wherein one is measurement slip III, another root is auxiliary slip III ', and the index dial of two slide wire discs divides 10 big lattice, and the resistance of every big lattice correspondence is 10 Ω, every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; Second step disc is made up of measuring disk II and bracket panel II ', measuring disk II has 0,1,2 ... 10 totally 11 gears have the resistance of 11 110 Ω to connect into ring network: the 1st resistance R above
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, the 10th resistance R
10The other end and the 11st resistance R
11The point that connects of an end be circuit node A, the 11st resistance R
11The other end and the 1st resistance R
1Other end tie point be circuit node B, resistance R
1With resistance R
2Tie point be connected resistance R through 200 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 120 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 60 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 20 Ω resistance with the 4th contact
5With resistance R
6Tie point be connected resistance R with the 5th contact
6With resistance R
7Tie point be connected resistance R with the 6th contact
7With resistance R
8Tie point be connected resistance R through 20 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 60 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 120 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 200 Ω resistance with the 10th contact
1With resistance R
11The Node B that connects o'clock is connected with the 0th contact through 300 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc; Pass through 2000 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the brush of bracket panel II ' connects the 22nd contact of measuring disk I and connects the 0th contact connecting circuit node A of measuring disk I, bracket panel II ' the 10th contact and 23000 Ω resistance R
13End point in parallel be node C, resistance R
13The other end connect to measure top " 0 " point of slip III, the end " 10 " of measuring slip III is o'clock through 900 Ω resistance R
14Back connecting circuit Node B; Node C is through 190/7 Ω resistance R
15Back and 13 Ω range transfer resistance R
16One end is connected in parallel on node D, and node D connects the positive pole of pressure measuring instrument working power, range transfer resistance R
16The other end be connected in range selector K
1-1* 0.01 range contact and * 0.1 range contact, 117 Ω range transfer resistance R
17An end connect range selector K
1-1* 1 range contact, the other end and range selector K
1-1* 0.1 range contact connects Node B connection range selector K
1-1* 10 range contacts after with range selector K
1-2* connection of 1 range contact; Range selector K
1-2* 1 range contact and range selector K
1-2* 0.1 range contact is through 117 Ω range transfer resistance R
18Connect range selector K
1-2* 0.1 range contact and range selector K
1-2* 0.01 range contact is through 11700 Ω range transfer resistance R
19Connect range selector K
1-3* 10 range contacts and range selector K
1-3* 1 range contact is through 1053 Ω auxiliary resistance R
20Connect range selector K
1-3* 1 range contact and range selector K
1-3* 0.1 range contact is through 104.13 Ω auxiliary resistance R
21Connect 104.013 Ω auxiliary resistance R
22An end connect range selector K
1-3* 1 range contact, the other end and range selector K
1-3* 0.01 range contact connects three cuttves, four throw switch K
1Three layers: K
1-1Layer, K
1-2Layer and K
1-3Three normally closed contacts of layer connect range selector K with lead
1-3* 10 range contacts connect the setting resistance R
NNoble potential one end; Pressure measuring instrument connects measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K
2The back is connected with auxiliary slip III '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101554278A CN101710143B (en) | 2009-12-14 | 2009-12-14 | Four-range voltage measuring meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101554278A CN101710143B (en) | 2009-12-14 | 2009-12-14 | Four-range voltage measuring meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101710143A true CN101710143A (en) | 2010-05-19 |
| CN101710143B CN101710143B (en) | 2011-04-06 |
Family
ID=42402940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101554278A Expired - Fee Related CN101710143B (en) | 2009-12-14 | 2009-12-14 | Four-range voltage measuring meter |
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| Country | Link |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2478966A (en) * | 1948-03-29 | 1949-08-16 | Weston Electrical Instr Corp | Dual purpose voltmeter range attenuator |
| US3284709A (en) * | 1962-01-17 | 1966-11-08 | American Gage & Mach | Precision voltmeter using selectable series connected, digitally related resistors which are calibrated to read the value of input signal |
| US3781679A (en) * | 1973-02-05 | 1973-12-25 | T Matsumoto | Logarithmic recording system |
| US4143317A (en) * | 1976-09-27 | 1979-03-06 | Outboard Marine Corporation | Multiple range peak reading voltmeter |
| CN1425923A (en) * | 2001-12-08 | 2003-06-25 | 骆乃光 | Multiple measuring range DC potential difference meter |
| CN201017005Y (en) * | 2007-04-03 | 2008-02-06 | 方勇 | Four-range portable potentiometer |
| CN201035069Y (en) * | 2007-04-03 | 2008-03-12 | 李顺定 | Four-range portable potential difference meter |
| CN201035083Y (en) * | 2007-05-29 | 2008-03-12 | 张春雷 | Voltage measurement instrument with multi-range high distinguishability |
| CN201555877U (en) * | 2009-12-14 | 2010-08-18 | 骆洪亮 | Four-range voltage measuring instrument |
-
2009
- 2009-12-14 CN CN2009101554278A patent/CN101710143B/en not_active Expired - Fee Related
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| CN101710143B (en) | 2011-04-06 |
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